Portion of an ambulatory device



FIG. 1 is a front-right-top isometric view of a portion of an ambulatory device showing the new design;

FIG. 2 is a rear-left-top isometric view thereof;

FIG. 3 is a right side elevation thereof;

FIG. 4 is a left side elevation thereof;

FIG. 5 is a front elevation thereof;

FIG. 6 is a rear elevation thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design. 

We claim the ornamental design for a portion of an ambulatory device, as shown and described. 